Turbine rotor



Jan. 11,1927. 1,614,145

S. A. MOSS TURBINE ROTOR Fil ed Sept. 11. 1925' Inventowi Sanfovd A. Moss,

y W His Attorneg.

Pat nted '1 [lair-sols TEs PATENT" mm,-

sen'roan A. nods, or LYNN, nssscnusn'r'rs, ASSIGNOB 'ro GENERAL Emerald i'con'nnr, A conrona'rron or NEW Yoax.

rennin no'roa Application fled-September 11, 1925. Serial No. 55,885.

In connection with certain turbine applications such as, for example, exhaust gas driven turbo-compressors, utilized for supercharging internal combustion engines, the 1 turbine rotor is required to operate at'ver high speed and is subjected to very big temperatures. For exam le, it may be .re-'

quired to operate at spee s of the order of 30,000 to 40,000 revolutions 'per minute and H at temperatures of the order of 1400 degrees F. This is service of severe character and requires that the rotor be strong and that the buckets be securely attached to it.

The object of'my invention is to I an improved rotor construction whic while being strong and thoroughly capable of operating under conditions of the character of those set forth above, is at the same tnne comparatively light in weight, simple in .30 structure, and capable of being manufactured at low cost. i I

For a consideration of what I-believe to be novel and my invention, attention is dirooted to the accom anying description and the claims appende thereto.

In the drawing, the figure is a side view, partly in section, of a rotor embodying my invention. 1

Referring to the'drawing', 1 indicates a so turbine rotor shaftwhich may be mounted 1 in a suitable hearing or bearings (not shown) and which may drive a com ressor or other machine One end of shaft i is enlarged as is indicated at to form a sort of as hub and this hub merges a flange or soils! 3 a hat end it At the center of iiange 3 is a recess 5 and in 4: adjacent to the periphery of flange 3 is an annular groove 6, The outer wall of groove o 6 is indicated at 7 and this wall is cut away somewhat so that it is not flush with end face 4 but terminates short thereof.

Attached to flange 3 by suitable fastening means, such as rivets 8, is a flat annular plate 9 having a projection 10 at its center which fits in recess 5.. Recess 5 and pro ection 10 serve to center plate 9 on flange 3.

The rivets 8 are located adjacent to theperiphery of the plate and flange where the centrifugal stresses are low. As a result,

the presence of the openings through which they pass requires that but little additional metal be provided .at the peripheries of the flange and plate in order to maintain the strength of the wheel.

mentary to groove 6.

16 which are located in rovide In the innerface of plate 9 adjacent. to its periphery is an annular move 11 compleuter wall 12- of groove 11 is cut away somewhat also so as to provide an annular spacebetween'walls 7 an 12.

Grooves .6 and 11 together. provide an annular undercut groove surrounding the periphery of the rotor. Mounted in this groove are the bases 13 of turbine buckets 14, the fbases beingprovided with slots 15 in which walls 7 and 12 are located and with tongues coves 6 and 11. rovided a ovetail connection uckets and the wheel. The

There'is-thus between the ill space the buckets, althoug under circumstances requiring it, spacing blocks may be used as is well understood.

With the above described construction, it

will be seen that there are no openings through the rotor adjacent to its center, which is the region where the greatest stresses occur. T is means that the rotor is of maximum strength for the amount of material employed and ofiers the maximum resistance to centrifugal stresses. Or other wise considered, it means that the parts may have the minimum weight and size con- 88 sistent withthe'service conditions they are required to meet, This is of particular importance in the case of high speed rotors for it decreases the load on the-bearings and the ill effect of any unbalance. Also,- light on weigh, decreases the time required for acu coloration, a thing of. eat importance in the case of machines w ich operate at variahle speeds. At the same time, however, the rotor is sim 1e in structure and capable or, of being manu actured at low cost.

In accordance. with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the ap aratus shown is only illustrative and that the invention may be carried out by other means.

. .What I claim as new and desire to secure --by-Letters Patent of the United States, is:

1. A rotor comprising-a shaft having a flange inte a1 therewith, said flange pre-' sentmg a at end face, a plate having an imperforate central portion, means fastening the plate and flange together, and

buckets held between the flange and plate. 2. A rotor comprising a-shaft having an integral flangeat one end, a plate having an imperforate' central portion, means .lo-:

cated adjacent to the periphery "of the plate for fastening the plate to the fla and buckets held between the plate and ange.

3.- A rotor comprising a shaft having an integral .flange at one end, a plate attached to said flange, said plate having an imperforate central portion, complementary annular grooves in ad acent faces of said my hand this 8th which 'exten through the pla e and flange adjacent .to their ripheries for fastening them together, sai plate and flange except for the rivet openings being imperforate,.

and buckets having their bases held between the peripheries of said plate and flange.

In witness whereof,

day of Se tember, 1925. SANFOR A. MOSS.

have hereunto set 

